![]() ![]() ![]() In this review article, some of the optical angle sensor techniques based on the mode-locked femtosecond laser are introduced. In recent years, a mode-locked femtosecond laser has increasing application in angle measurement, where the unique characteristics of the mode-locked femtosecond laser such as the stable optical frequencies, equally-spaced modes in frequency domain, and the ultra-short pulse trains with a high peak power are utilized to achieve precision and stable angle measurement. Many efforts have been made so far to apply the mode-locked femtosecond laser to the absolute distance measurement. A mode-locked femtosecond laser, which is often referred to as the optical frequency comb, has increasing applications in various industrial fields, including production engineering, in the last two decades. ![]()
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